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Thread: setting your pinion angle

  1. #16
    switchhitter streetswepa's Avatar
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    quick question, I'm just in the process of setting my pinion angle, and was wondering what my diff should be set at?
    I have the frame at ride height, and right now the driveshaft is reading -6 and my diff is at -3, and if i'm not mistaken I want the diff to be at +1 right?

  2. #17
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    OK,

    to make it simple for me and others that have a hard time undertsanding exactly whats going on,

    if the truck gets lowered 3" , what has to be done?

  3. #18
    Senior Member bigjsp's Avatar
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    Here as simple as I can make it, forget about the driveshaft.

    All that mattters is the relative angle between the output of the tranny and the pinion.

    draw a line on a piece of paper representing the crank, get its angle relative to the ground off the valve cover using a "Dangle" finder.

    draw a line representing the pinion, gets its angle. relative to the ground.


    you want the pinion to be pointing down or negative 3 degrees, compared to the angle of the crankshaft, so that when the rear suspension flexs up under power it end up near -1 degree although there is some play.


    All else fails find someone who has the exact some set up and copy what they did. OR the emperical method, buy some shims and keep adjustng or changing reversing them.


    2 piece shafts are even more fun. I generally try to run the front part of the shaft at the factory setting, then use it as my parallel / crank centerlin point for the rear half..............if that confused you ignore it.

  4. #19
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    OK,

    Let me ask this then:

    I have a 97 4x4 2 door 5 speed blazer, I've dropped the front appox. 3" by adjusting the keys (no bump stops & removing the adjuster bolts.)

    I will be dropping the rear with 3" drop replacement leafs.

    anyone elsewith a similar set up?

    What have others done? i think anyone with a 3" drop in the rear ( no matter how they did it ) should have similar adjustments.
    I don't think the drop in the front matter all that much, unless its really low, since dropping the front doesn't effect the driveline.

    when you drop the rear, you are raising the differential, which effectivly changes the angle of the driveshaft, and any way you lower the rear (leafs,blocks, bags) you end up doing the same thing to the rear end.
    So trucks with similar suspension changes in the rear, should have similar changes in pinion angle, to correct.
    Last edited by ///ARINUTS...; 10-19-2005 at 11:59 AM.

  5. #20
    Registered User kwickez's Avatar
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    so,i get the measuring the diveshaft near the rear ujoint and then in the rear ujoint cap to get the angle difference,but do i need to measure the front towards the tranny also to get the correct pinion angle?

  6. #21
    Senior Member bigjsp's Avatar
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    If you use my method described above, you never measure the angle of the driveshaft, Only calculate the angle of the pinion relative to the crank,and do this preferably at ride height.

    Other measurements just confuse the issue and can change too much, particulary if there is an error in the measurement.

  7. #22
    Registered User kwickez's Avatar
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    k i found that the angle is 2* off,but i saw this boot on the tranny/spline and wasnt sure if it looks normal or something is off.

    <a href="http://photobucket.com" target="_blank"><img src="http://i151.photobucket.com/albums/s142/kwickez/DSC05814.jpg" border="0" alt="Photobucket"></a>

  8. #23
    Registered User kwickez's Avatar
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    k i found that the angle is 2* off,but i saw this black boot on the left of screen on the tranny/spline and wasnt sure if it looks normal or something is off.

    Last edited by kwickez; 06-30-2010 at 09:42 PM.

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